Manhole-cover lock



Dec. 7 ,1926. v

. C. B.. FAIRWEATHER MANHOLE COVER LOCK Filed Oct. 31,

Patented Dec. 7', 1926.

UNITED STATES PATENT oFFIcEQ- CHARLES B. FAIRWEATHER, or was]: CHESTER, PENNSYLVANIA, AssIGNoR TO LENAPE HYDRAULIC PRESSING & FQRGING 00., or LENAIPE,PENNS YLVANIA, A

CORPORATION OF DELAWARE.

"MANHOLE-COVER LooK.

Application'filed October 31, 1925. Serial No. 65,964.

My invention relates to certain improvements in looks for securing man-hole coverplates to intake casings or boxes.

The object of my invention is to locate the lock on the inner side of the cover-plate, and to provide means for actuating the look through small openings in the plate, the means also being used to turn the plate clear of the keepers on the casing.

The invention is particularly useful in looking the cover-plates of street or road intakes, or valve boxes, but it will be under stood that the-lock can be usedto fasten any type of cover-plate.

In the accompanying drawing:- Fig. 1 is a sectional view of a man-hole casing, showing the cover and thelocking mechanism. the section being on the line 1-1, Fig. 2;

Fig. 2 is a plan view;

r Fig. 3 is a sectional view on the line 3-3,

' ig. 4 is a sectional perspective-view of a portion of the casing showing one of the keepers Fig. 5 is a sectional perspective view of a portion of a cover-plate and-lock;

Fig. 6 is a detached perspectlve view of the locking-bar; and

Fig. 7 is a perspective View of thekey 'The casing or box 1 may be .of any shape desired. In the present instance, the casing has a flange 2, with an upturned edge 3 forming a recessed bearing for the coverplate 4, the top of which is flushed with the.

' edge 3, as shown in Fig. 1.

On' the casing are keepers 5, which are notched at the underside, as at 6, to receive the ends? of the locking-bar 8, Fig. 6,

40 carried by the cover-plate 4. The underside of the keepers 5 are beveled, as at 9, so

that when the cover-plate is turned to the locking position,' the locking-bar will be depressed and will snap into the notches 6. The locking-bar 8 is adapted to U-shaped guides 10, which are welded to the underside of the cover-plate 4. The bar is held from moving longitudinally by extensions 11, which are located in the space between the guides 10, as shown in Fig. 1. Springs 12 are located on screw-studs 13 within the guides 10 and yieldingly support the locking-bar 8. The tensionof the springs can be regulated by turning the screw-studs, and on removing the studs, the

springs can be withdrawn and replaced by other springs, if found necessary.

In the cover-plate directly above thelocking-bar are two holes. for the reception of pins 14 of a key-15, Fig. 7. The cross-bar -ofthe key forms a substantial handle by the cover-plate in position. The lock can be actuated by any tool passed through the opening in the plate, and on turning the plate, it isfree to be removed.

I claim: K

1. A combination of a casing having notched keepers; a cover-plate having guides on its underside; a locking bar mounted in the guides and extending under the keepers; means for holding the supporting bar in the notches of the keepers; the said plate perforated fora key which will depress the bar plate to be turned clearof the k and allow the keepers.

2. The combination of a casing having notched keepers; a cover-plate having U- shaped guides on its under side; a lockingbar mounted in the guides and extending under the keepers; and springs in the guides yieldingly supporting the bar, the plate being perforated for a key which will depress the bar and turn the plate when released from the keepers.

3. A combination of a casing having keepers notched at their underside and beveled at each side of the notch; a. cover plate-'niounted on the casing and having U-shapcd guides; a locking bar adapted to the guides; means carried by the U-shaped guides for holding the supporting bar in engagement with'the notched keepers,.the

plate being perforated for a key which will depress the bar and turn the plate when released from the keepers. 4. The combination of acasing having two oppositely disposed keepers, each keeper having a notch in its underside andbeveled at each side of the notch; a cover-plate mounted on the casing and having U-shaped guides on its underside a locking-bar mount- 5 ed in the guides and having ends extending into the notches of the keepers when in the. locked position, said bar having extensions for holding the bar in position; and springs in the guides for supporting the bar, and screw-studs forming adjustable supports for the spring, the plate being perforated in line Y With the bar for the reception of a key for depressing the bar and turning the plate.

CHARLES B. FAIRWEATHER. 

